Airship



FIG. 1 is a front perspective view of an airship showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings illustrate portions of the airship that form no part of the claimed design. 

CLAIM The ornamental design for an airship, as shown and described. 